package com.lyd.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.lyd.reggie.common.BaseContext;
import com.lyd.reggie.common.R;
import com.lyd.reggie.entity.ShoppingCart;
import com.lyd.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

@RestController
@RequestMapping("/shoppingCart")
@Slf4j
public class ShoppingCartController {

    @Autowired
    private ShoppingCartService shoppingCartService;


    /**
     * 添加购物车
     * @param shoppingCart
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
        log.info("shoppingCart:{}",shoppingCart);

        //设置用户id，指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        //添加判断，当前添加的如果不是菜品，就是套餐,反之亦然
        Long dishId = shoppingCart.getDishId();

        LambdaQueryWrapper<ShoppingCart> queryWrapper =new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);

        if (dishId!=null){
            //添加到购物车的是菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);

        }else {
         //添加到购物车的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
        //查询当前菜品或套餐在购物车中是否存在
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

        if (cartServiceOne!=null){
            //如果存在，则在原来的数量上+1
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number+1);
            shoppingCartService.updateById(cartServiceOne);
        }else {
            //如果不存在，则添加到购物车中，默认数量为1
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());   //手动设置加入购物车时间
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }


        return R.success(cartServiceOne);
    }


    /**
     * 物车菜品或套餐数量-1
     * @param shoppingCart
     * @return
     */
    @PostMapping("/sub")
    public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart){
        log.info("shoppingCart:{}",shoppingCart);

        //设置用户id，指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        //添加判断，当前删除的如果不是菜品，就是套餐,反之亦然
        Long dishId = shoppingCart.getDishId();

        LambdaQueryWrapper<ShoppingCart> queryWrapper =new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);

        if (dishId!=null){
            //删除的是菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else {
            //删除的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }

        //对删除的菜品或套餐的数量，在原来的数量上-1
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

        Integer number = cartServiceOne.getNumber();
        if (number>=1){
            cartServiceOne.setNumber(number-1);
            shoppingCartService.updateById(cartServiceOne);
        }else {
            shoppingCartService.removeById(cartServiceOne);   //从数据表中删除
        }


        return R.success(cartServiceOne);
    }


    /**
     * 查看购物车
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list(){
        log.info("查看购物车");

        LambdaQueryWrapper<ShoppingCart> queryWrapper =new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        queryWrapper.orderByAsc(ShoppingCart::getCreateTime);

        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);

        return R.success(list);
    }


    /**
     * 清空购物车
     * @return
     */
    @DeleteMapping("/clean")
    public R<String> clean(){
        LambdaQueryWrapper<ShoppingCart> queryWrapper =new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());

        shoppingCartService.remove(queryWrapper);
        return R.success("清空成功");
    }



}
